I think SONY got that idea from the bottom half of my webpage here
http://stereo.jpn.org/eng/stphmkr/help/file_27.htm I have been working on implementing this for SDM.
It will create a 360 degree stereo panorama approximately 20,000 x 3000 pixels in size.
HOWEVER, it will take about two minutes to acquire the images and stitching will be done on the PC.
CHDK/SDM supported cameras cannot capture the images fast enough at high resolution to truly replicate SONY's Sweep Panorama function.